Put everything through shellcheck

AppRun

@@ -1,4 +1,4 @@
 #!/bin/sh
-HERE=$(dirname $(readlink -f "${0}"))
-export LD_LIBRARY_PATH="${HERE}":$PATH
-"${HERE}"/$APPDWARF_CMD "$@"
+HERE=$(dirname "$(readlink -f "${0}")")
+export LD_LIBRARY_PATH="${HERE}":"$PATH"
+"${HERE}"/"$APPDWARF_CMD" "$@"

appdwarf

@@ -2,8 +2,8 @@
 set -eo pipefail
 IFS=$'\n\t'
 VER=2
-HERE=$(dirname $(readlink -f "${0}"))
-source $HERE/headers
+HERE=$(dirname "$(readlink -f "${0}")")
+source "$HERE/headers"
 
 usage(){
     echo "Usage: $(basename "$0") [option] [FILE/FOLDER/URL]"
@@ -14,12 +14,12 @@ usage(){
     echo "    -s,  --separate     Use old, separated header format"
     echo "    -u,  --url          Fetch AppImage from URL and convert to appdwarf"
 
-    echo "    -h,  --help         Print this help text"
+    echo "    -h,  --help         iPrint this help text"
     echo "    -v,  --version      Print the appdwarf version"
 }
 
 dwarf() {
-    mkdwarfs -i "$1" -o "$(realpath "$1").sh" -B$back "${@:2}" --header $HEAD
+    mkdwarfs -i "$1" -o "$(realpath "$1").sh" -B"$back" "${@:2}" --header "$HEAD"
     chmod +x "$(realpath "$1").sh"
 }
 
@@ -58,7 +58,7 @@ do
             exit 0
             ;;
         --folder | -f) 
-            header_folder $(realpath $2)
+            header_folder "$(realpath "$2")"
             shift 2
             ;;
         --lookback | -b) 

apps/appimage

@@ -1,5 +1,5 @@
 #!/bin/bash
 LINK1=https://raw.githubusercontent.com/AppImage/appimage.github.io/master/apps/$1.md
-LINK2="$(curl $LINK1 | grep -o https.\*releases | sed 's|github.com|api.github.com/repos|')"
-LINK3="$(curl $LINK2 | grep -v arm64 | grep -om1 https.\*AppImage)"
-appdwarf -u $LINK3
+LINK2="$(curl "$LINK1" | grep -o https.\*releases | sed 's|github.com|api.github.com/repos|')"
+LINK3="$(curl "$LINK2" | grep -v arm64 | grep -om1 https.\*AppImage)"
+appdwarf -u "$LINK3"

apps/mkgo

@@ -1,9 +1,9 @@
 #!/bin/bash
-PATH=$(dirname $(readlink -f "${0}"))/..:$PATH
+PATH=$(dirname "$(readlink -f "${0}")")/..:$PATH
 DIR=/tmp/dwarf-portable-executable
 mkdir -p $DIR
 LINK=$(curl -sL https://golang.org/dl | grep -om1 dl/go.\*linux-amd64.tar.gz)
-curl -L https://golang.org/$LINK | tar xz -C$DIR
+curl -L https://golang.org/"$LINK" | tar xz -C$DIR
 
 cat > $DIR/go/AppRun << 'EOF'
 #!/bin/sh

apps/mkjava

@@ -1,12 +1,12 @@
 #!/bin/bash
-PATH=$(dirname $(readlink -f "${0}"))/..:$PATH
+PATH=$(dirname "$(readlink -f "${0}")")/..:$PATH
 DIR=/tmp/dwarf-portable-executable/java
 JRE=$DIR/jre
 VER=$1
 mkdir -p $DIR
 
 LINK=https://api.adoptium.net/v3/binary/latest/$1/ga/linux/x64/jdk/hotspot/normal/eclipse
-curl -L $LINK | tar xz -C$DIR
+curl -L "$LINK" | tar xz -C$DIR
 $DIR/jdk*/bin/jlink --add-modules ALL-MODULE-PATH --output $JRE --strip-debug --no-man-pages --no-header-files --compress=0
 
 
@@ -21,5 +21,5 @@ chmod +x $JRE/AppRun
 
 shift
 appdwarf $JRE $@
-mv $JRE.sh java$VER
+mv $JRE.sh java"$VER"
 rm -rf $DIR

apps/mkproton

@@ -1,10 +1,10 @@
 #!/bin/bash
-PATH=$(dirname $(readlink -f "${0}"))/..:$PATH
+PATH=$(dirname "$(readlink -f "${0}")")/..:$PATH
 DIR=/tmp/dwarf-portable-executable/proton
 mkdir -p $DIR
 
 LINK="$(curl https://api.github.com/repos/GloriousEggroll/proton-ge-custom/releases | grep -om1 http.\*tar.gz)"
-curl -L $LINK | tar xz -C$DIR
+curl -L "$LINK" | tar xz -C$DIR
 mv $DIR/Proton*/files/* $DIR
 rm -rf $DIR/Proton*/
 

apps/mkwine

@@ -1,5 +1,5 @@
 #!/bin/bash
-PATH=$(dirname $(readlink -f "${0}"))/..:$PATH
+PATH=$(dirname "$(readlink -f "${0}")")/..:$PATH
 DIR=/tmp/dwarf-portable-executable/wine
 mkdir -p $DIR
 

headers

@@ -35,7 +35,7 @@ EOF
 
 header_folder() {
     echo '#!/bin/sh' > $HEAD
-    echo DIR=\"$1\" >> $HEAD
+    echo DIR=\""$1"\" >> $HEAD
     cat >> $HEAD << 'EOF'
 if [ ! -d "$DIR" ]; then
     mkdir "$DIR"